A fusion of Risk and Bejewelled, Samurai Puzzle Battle (Game of the Year Edition) is available on the App Store now for 0.59p and, if you're willing to put the time in to learn and get comfortable with all of it's aspects, will be a rewarding and excellent value game.
The game is split into 2 areas, the Map and the Puzzle areas. The map is straight forward and instantly recognisable to players of games like Risk or Civilisation. The map is split into islands of different sizes, with each island occupied by one or more Shogun. Each Shogun has a castle in which they live and from which units are created with Gold. Defeating al of the other Shoguns is the ultimate aim of the game and will see you crowned ultimate ruler of Japan.